You must have admin-level access to the web interface of the SPA from your current location;

The port you wish to configure is unlocked, i.e. not tied to a service provider (if you are asked for a password to configure a port, and your provider has not furnished you with the password, the port will be "locked" and you will be unable to configure it with this wizard);

A completely unlocked device must be used for any of the settings that require STUN or if you attempt to change the timezone (i.e. Line 1 cannot be locked by a provider);